Measurement of transverse single-spin asymmetries for Dijet production in proton-proton collisions at Vs=200 GeV

Y. Bai; F. Benedosso; M.A.J. Botje; O. Grebenyuk; A. Mischke; T. Peitzmann; M.J. Russcher; R.J.M. Snellings; N. van der Kolk

Measurement of transverse single-spin asymmetries for Dijet production in proton-proton collisions at Vs=200 GeV

Y. Bai, F. Benedosso, M.A.J. Botje, O. Grebenyuk, A. Mischke, T. Peitzmann, M.J. Russcher, R.J.M. Snellings, N. van der Kolk

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Abstract

We report the first measurement of the opening angle distribution between pairs of jets produced in high-energy collisions of transversely polarized protons. The measurement probes (Sivers) correlations between the transverse spin orientation of a proton and the transverse momentum directions of its partons. With both beams polarized, the wide pseudorapidity (-1≤η≤+2) coverage for jets permits separation of Sivers functions for the valence and sea regions. The resulting asymmetries are all consistent with zero and considerably smaller than Sivers effects observed in semi-inclusive deep inelastic scattering. We discuss theoretical attempts to reconcile the new results with the sizable transverse spin effects seen in semi-inclusive deep inelastic scattering and forward hadron production in pp collisions.

Original language	Undefined/Unknown
Pages (from-to)	142003/1-142003/6
Number of pages	6
Journal	Physical Review Letters
Volume	99
Issue number	14
Publication status	Published - 2007

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title = "Measurement of transverse single-spin asymmetries for Dijet production in proton-proton collisions at Vs=200 GeV",

abstract = "We report the first measurement of the opening angle distribution between pairs of jets produced in high-energy collisions of transversely polarized protons. The measurement probes (Sivers) correlations between the transverse spin orientation of a proton and the transverse momentum directions of its partons. With both beams polarized, the wide pseudorapidity (-1≤η≤+2) coverage for jets permits separation of Sivers functions for the valence and sea regions. The resulting asymmetries are all consistent with zero and considerably smaller than Sivers effects observed in semi-inclusive deep inelastic scattering. We discuss theoretical attempts to reconcile the new results with the sizable transverse spin effects seen in semi-inclusive deep inelastic scattering and forward hadron production in pp collisions.",

author = "Y. Bai and F. Benedosso and M.A.J. Botje and O. Grebenyuk and A. Mischke and T. Peitzmann and M.J. Russcher and R.J.M. Snellings and {van der Kolk}, N.",

note = "STAR Collaboration",

year = "2007",

language = "Undefined/Unknown",

volume = "99",

pages = "142003/1--142003/6",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

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TY - JOUR

T1 - Measurement of transverse single-spin asymmetries for Dijet production in proton-proton collisions at Vs=200 GeV

AU - Bai, Y.

AU - Benedosso, F.

AU - Botje, M.A.J.

AU - Grebenyuk, O.

AU - Mischke, A.

AU - Peitzmann, T.

AU - Russcher, M.J.

AU - Snellings, R.J.M.

AU - van der Kolk, N.

N1 - STAR Collaboration

PY - 2007

Y1 - 2007

N2 - We report the first measurement of the opening angle distribution between pairs of jets produced in high-energy collisions of transversely polarized protons. The measurement probes (Sivers) correlations between the transverse spin orientation of a proton and the transverse momentum directions of its partons. With both beams polarized, the wide pseudorapidity (-1≤η≤+2) coverage for jets permits separation of Sivers functions for the valence and sea regions. The resulting asymmetries are all consistent with zero and considerably smaller than Sivers effects observed in semi-inclusive deep inelastic scattering. We discuss theoretical attempts to reconcile the new results with the sizable transverse spin effects seen in semi-inclusive deep inelastic scattering and forward hadron production in pp collisions.

AB - We report the first measurement of the opening angle distribution between pairs of jets produced in high-energy collisions of transversely polarized protons. The measurement probes (Sivers) correlations between the transverse spin orientation of a proton and the transverse momentum directions of its partons. With both beams polarized, the wide pseudorapidity (-1≤η≤+2) coverage for jets permits separation of Sivers functions for the valence and sea regions. The resulting asymmetries are all consistent with zero and considerably smaller than Sivers effects observed in semi-inclusive deep inelastic scattering. We discuss theoretical attempts to reconcile the new results with the sizable transverse spin effects seen in semi-inclusive deep inelastic scattering and forward hadron production in pp collisions.

M3 - Article

SN - 0031-9007

VL - 99

SP - 142003/1-142003/6

JO - Physical Review Letters

JF - Physical Review Letters

IS - 14

ER -